Process for the production of the esters of the tertiary alcohols.



E E5; Ald E l PAUL NEUMANN AND JOSE]? ZELTNER, 0F CHABLOTTENBURG, GERMANY.

PROCESS FOETHE PRODUCTION OF THE ESTERS OF THE TERTIARY ALCOHOLS.

No Drawing.-

To all whom it may concern: I

Be it known that we, PAUL NEUMANN, a subject of the German Emperor, and JosEr ZELTNER, a subject of the Russian Emperor, and residing at Charlottenburg, Germany, have invented a certain new and useful Improved Process for the Production of the Esters of the Tertiary Alcohols, of which the following is a specification.

This invention relates to a process for the production of the esters of the tertiary alcohols. Heretofore the production of the esters of the tertiary alcohols has been more diflicult than the production of esters of the primary and secondary alcohols. For example from the actionof acids on the ter= tiary amyl alcohol, only traces of the corre-- sponding esters are obtained. If larger yields of these compounds are des1red,'1t is necessary to treat the corresponding acid with amylen and with zinc chlorid (Kondakoif, Journal of the Russ-Phys.0kem. S00. 1893, 25 439). Further, treating the acid chlorids and tertiary amyl alcohol does not give satisfactory results as the reaction is an abnormal one. For example, the'action of 'acetyl chlorid on tertiary amyl alcohol does not produce the acetic ester of amylenhydrate as would be expected but merely yields the tertiary amyl chlorid and acetic acid.

The chief feature of this invention is that the esters of the tertiary alcohols may be i obtained from the acid chlorids if the reaction be carried out in the presence of a tertertiary alcohols is produced from carbamic chlorid in the presence of tertiary bases. Howeyer the next homologous chlorid to the carbami chlorid namely the chlorid of carbonic acid cannot be converted into an ester of a tertiary alcohol in the presence of tertiary bases. Uonsequently it did not appear to be at all probable that other acids or chloridswould form esters with tertiary alcohols in the presence of tertiary bases; according to this invention, however, the carboxylic esters of the tertiary alcohols have been obtained by dissolving the necessary compounds for their production in a tertiary. base, for example, pyridin, at normal temperature or on gently heating.

Example I: 14: grams of tertiary amyl alcohol are dissolved in 55 grams of pyridin Specification of Letters'Patent.

Application filed November 6, 1913.

rated and distilled in vacuo.

Patenteddan.5,1915.

Serial No. 799,604.

at normal indoor temperature and water and hydrochloric acid are added to the mixture and the tertiary amyl valerate is sepa- The distillate boils at 75 C. at a pressure of approximately 15 mm. and possesses the properties described in the literature on the subject.

Example II: 88 grams of tertiary amyl alcohol are dissolved in 14.0 grams ,of dimtheylanilin and 17 7 grams of cinnamyl chlorid are gradually added. After a lapse of 2 1 hours the product is treated as in Example I and the tertiary amyl cinnamate, an ester hitherto unobtainable and a good yield of which is now obtained, is distilled over.

'It boils at a pressure of approximately 15 ily be added whereby a bromin derivative is obtained which is diflicult to distil and very' stable and which solidifies in a freezing mixture. It melts at a temperature of 39 to 40 0.

Example III: 37 grams bromovaleryl chlorid are caused to react with 15' grams of tertiary amyl alcohol and 30 grams of dimethylanilin. On warming on the water bath dimethylanilfn hydrobromid separates out. The product of the reaction is washed with water, then with sodium carbonate and the tertiary amyl bromovalerate is distilled in cacao. The substance boils at 133 C. to 115 at 13 mm. pressure and is a watercolored liquid having a slight odor and a neutral reaction.

Example IV: 88 grams of tertiary amyl alcohol, 150 grams of dimethylanilin and 140 grams of benzoyl chlorid are mixed togather and heated for some hours at 90 C. The mixture is treated in succession with water, by hydrochloric acid and sodium carbonate and the amyl benzoate is distilled over. The boiling point is 120 C. to 123 C. at a pressure of 13 mm.

Example V: 50 grams of tertiary amyl alcohol are dissolved in 50 grams of pyridin mixed with 100 grams of p-nitrobenzoic chlorid. "When the reaction is complete the mixture is treated in the manner indicated in Example IV and the ester obtained which melts at 418 C. after recrystallizing out the methyl alcohol. By the action of reducing agents upon this substance the corresponding amin ester is obtained which melts at 58 C. to 59 C. It crystallizes in white The tertiary amylacetate boils at 121 C;

to 123 C. at ordinary pressure.

We claim: I g 1.' A process for the production of tertiary alcohol esters of organic acidshaviixg their carboxyl group attached to carbon consisting in mixing tertiary alcohols with the tertiary bases and then adding to the mixture chlorids of said organic acids.

2. A process for the production of tertiary alcohol esters of organic acids having their carboxyl group attached to carbon, 20

consisting in causing chlorids of organic acids to react with tertiary alcohols in the presence of tertiary bases.

In testimony whereof we aflix our signatures in the presence of two witnesses.

PAUL NEUMANN. JOSEF ZELTNER. Witnesses:

'. HENRY HAsPER,

WOLDEMAR HAUPT. 

